Experimental research on flexural toughness of green high performance fibre reinforced cementitious composites

摘要

Engineered cementitious composites (ECCs) have recently demonstrated excellent mechanical performances in civil engineering, thanks to their significant strain hardening behaviour under tension. As a new class of cement based composite materials, green high performance fibre reinforced cementitious composites (GHPFRCCs) have the optimised mixing proportion of ECC with high volume fly ash based on the orthogonal experiment method. In this study, the flexural toughness of GHPFRCC was carefully examined by inspecting the influences of fly ash content, water/binder ratio, sand/binder ratio, polyvinyl alcohol (PVA) fibre and water reducing agent. The results of four-point bending tests indicated that GHPFRCC beam can effectively disperse large cracks into harmless ones with ultrahigh energy dissipation capacity. The flexural toughness of GHPFRCC can retain a higher value with the fly ash content of 65% and PVA fibre content of 2%.